I don’t know about 35 other people supposedly rescued from the consulate. I do know that the rescue mission (Marines,) that was supposed to take place couldn’t because the airport was shut down and they had no place to land. They were delayed by seven or more hours because they had to drive from Tripoli to Benghazi. The 35 people you are talking about might be the other consulate employees who were not actually AT the consulate when the attack took place.
BENGHAZI, Libya, Sept 12 (Reuters) - A squad of U.S. troops despatched by helicopter across the Libyan desert to rescue besieged diplomats from Benghazi on Wednesday ran into a fierce overnight ambush that left a further two Americans dead, Libyan officials told Reuters.
Accounts of the mayhem at the U.S. consulate, where the ambassador and a fourth American died after a chaotic protest over a film insulting to Islam, remain patchy. But two Libyan officials, including the commander of a security force which escorted the U.S. rescuers, said a later assault on a supposedly safe refuge for the diplomats appeared professionally executed.
Miscommunication which understated the number of American survivors awaiting rescue - there were 37, nearly four times as many as the Libyan commander expected - also meant survivors and rescuers found themselves short of transport to escape this second battle, delaying an eventual dawn break for the airport.
This is only the beginning of the article that was out on September 13.
http://in.reuters.com/article/2012/09/12/libya-ambassador-battle-idINL5E8KCMYB20120912
Also, according to this timeline, the ambassadors is missing at 9:30 but 20 people are rescued at 2am.
http://www.theatlanticwire.com/global/2012/09/timeline-benghazi-attacks/57124/